I'll start with this and may think of more later — ask if you have questions.
Water ↑
Most ponds and other bodies of water are dry, that may change by Sunday. Ground is also harder than usual for this time of year — again this may change.
Vegetation ↑
The area is primarily mapped from aerial view, so most single large trees are mapped as forest (white area), not as green circles. Control descriptions still use distinctive tree.
Green × designates a standing dead tree (control description: distinctive tree, ruined); brown × is a fallen dead tree (rootstock).
Some of the open areas have taller grass (somewhat difficult to run through), and I have tried to avoid these areas as an obvious route choice.
Rocks ↑
Many are not yet mapped, especially if they are under tree cover.
Trails ↑
Major trails are reliable. However, as with most venues, minor/animal trails may not be on the map.
Contours ↑
4.8 m contours, very nice.
Notices ↑
Please respect equestrians: Give the right of way to horses, and try not to frighten them.
Also respect out-of-bounds areas — residential and other.